Troubleshooting Chart For The Synthesizer; Fig 21 Troubleshooting Chart For Synthesizer - Nokia RH-53 Troubleshooting Instructions

RH-53/54
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Troubleshooting chart for the Synthesizer

Figure 21:Troubleshooting chart for synthesizer
From Phoenix chose:
File > product > RH-53/54
Maintenance > Testing > RF controls > band > RX >
continous > channel
Spectrum analyser
VCO frequency (R640)
MHz (see table)
No
Osciloskope
VXO Power supply
(C618)
2.78Vdc
Yes
Osciloskope
VXO Power supply
(C620)
2.78Vdc
Yes
Osciloskope
VCXO output
(R420) 26MHz
approx. 700mVpp
Yes
Osciloskope
PLL Power supply
(C614, C634)
All 2.7Vdc
Yes
Osciloskope
PLL Charge pump
supply
(C616)
All 4.75Vdc
Yes
Spectrum analyser
VCO output (R640)
some signal between
3 and 4 GHz
ISSUE 1 09/2004
Band and channel according to the previous table
Yes
PLL block functional
No
Check UEM, SW
Phone not in function
No
Check R605, SW
Phone not in function
No
VCXO is not functional
Check crystal (B600)
No
Check UEM, SW
Phone not in function
Check R603, C645, UEM,
No
SW
Phone not in function
No
VCO (G600) is not functional
YES
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Nokia Customer Care
N600 not functional
Check Loop filter (R618,
R619, C639-C641)
33